Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Having specific delay in producing output waveform
Patent
1997-06-23
1998-11-10
Lam, Tuan T.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Having specific delay in producing output waveform
327277, H03K 513
Patent
active
058349600
ABSTRACT:
A semiconductor device includes an input terminal and an output terminal; a delay circuit including N (N=integer) unit delay circuits connected in series between the input terminal and the output terminal, earn unit delay circuit including first and second two-input NOR or NAND circuits connected in series, the second two-input NOR or NAND circuit being nearer to the output terminal than the first two-input NOR or NAND circuit, a first input of each first two-input NOR or NAND circuit being connected to the input terminal, and an output of each first two-input NOR or NAND circuit being connected to a first input of the second two-input NOR or NAND circuit of each unit delay circuit; and a control circuit outputting individual control signals, each control signal being applied to a respective second input of the second two-input NOR or NAND circuit included in each unit delay circuit, wherein delay time in signal transmission from the input terminal to the output terminal varies in response to the control signals. The number of elements per unit resolution is reduced, and variations in the delay time are reduced by the reduced element number so the linearity of the delay circuit is improved. Further, the layout is simplified as compared with the conventional delay circuit.
REFERENCES:
patent: 5317202 (1994-05-01), Waizman
patent: 5699003 (1997-12-01), Saeki
"Testabe Digital Delay Line", IBM Technical Disclosure Bulletin, vol. 38, No. 03, Mar. 1995, pp. 85-86.
Heima Tetsuya
Higashisaka Norio
Ohta Akira
Lam Tuan T.
Mitsubishi Denki & Kabushiki Kaisha
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